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2015年6月29日星期一

The principle of column speaker

The principle of column speaker

There are at least two speakers unit to be a column speaker,In a certain range of listening, the attenuation of sound is much lower than the sound point.For example, 5M distance, point sound source of about 14dB, and a high quality column speaker only attenuated the 7 dB, because the following is a times the gap, so the distance is far more obvious gap. In such a distance, the proportion of direct sound is beyond the sound of the reflection, the room or the environment can greatly reduce the impact of the hearing.

The assortment of column speaker

1.According to if built in amplifier or not: active column speaker&passive column speaker

2.According to the application:Professional column speaker,home theater column speaker,multi media column speaker.

3.According to the material:aluminum column speaker,wooden column speaker,plastic column speaker.

General speaking, aluminum column speaker and wood column speaker are better than plastic column speaker, but unless it is the high cost of paint processing, otherwise the appearance of wood sound column generally noteye-catching is basically only low-grade multimedia basic products will by wood column speaker. Some of the professional use of the column speaker will also use the wooden material, but the general is the use of plywood, and spray paint treatment, the effect can be guaranteed. Because of the low shell strength, the general effect is poor.

Kerry Luo

Dongchuang International Industrial Limited
Add: No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA

Tel: 86-757-88773347
Email: dongchuangyp001@126.com
Skype:dongchuangyp001
Wechat: LYY112126
QQ: 2850632517

2015年6月26日星期五

The problems between different amplifiers work with different speakers

The problems between different amplifiers work with different speakers

1.Can one amplifier to work with two different speakers? 

The power of the speakers are 6W ceiling speaker and 30W column speaker. The power is too different. The situation are the ceiling speaker can be max sound,but the column speaker may be just a little. It’s hard to adjust the good sound.

The best way to solve this problem is to add a volume control for ceiling speaker.Otherwise to take one more amplifier,one amplifier for the ceiling speaker, the other amplifier for column speaker.

2.Can two amplifiers to work with the same power speakers ? Can they use at the same time ?



They can not use at the same time as the amplifier will be overload. So it need to add a main power switch to choose the amplifiers to control the speakers.


Kerry Luo
Dongchuang International Industrial Limited
Add: No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA

Tel: 86-757-88773347
Email: dongchuangyp001@126.com
Skype:dongchuangyp001
Wechat: LYY112126
QQ: 2850632517

2015年6月25日星期四

The features of IP Network System

The features of IP Network System

Nowadays,IP Network system is more and more popular in the world. It was widely used in many places,there is no doubts that it is more easy and convenient.

Let’s find out why it was widely used in recent years :

1.Multiple partitions of broadcast:IP network system is an independent IP network node,
which has an independent IP address, which is an independent broadcast partition.Each IP network broadcast point can be simultaneously multiple partitions.The change in the partition does not involve any physical change.

2.Multiple channels:In the IP network system, every program is a set of IP data,
different broadcast programs can also be transmitted in a network cable,and have no effect on each other. CD audio files of the audio file is only 128KBPS,and the same time to broadcast 90 different CD level programs, the bandwidth occupied by only 12M,less than 15% of the 100M local area network.

3.Multiple control stations:All computers on the LAN IP can be used as a control station
to manage or use the IP network system, the computers can be built on the network.

4.System construction: Work with the IP terminal if there is IP Network .in the absence of IP network,the construction of a simple IP network is relatively fast.

5.PA sound better:IP network system using digital method, it is not affected by the transmission distance,covering the county city or province, are not subject to environmental impact,listeners were able to enjoy the high fidelity sound effects.

6.IP network system equipment is simple,the network broadcast terminal equipment adopts the embedded system to solidify on the processor chip.

7.System management is easy:IP network system administrators can preset for different users,different sets of time to set up a regular radio task, the system will automatically perform, truly unattended.

Kerry Luo
Dongchuang International Industrial Limited
Add: No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA

Tel: 86-757-88773347
Email: dongchuangyp001@126.com
Skype:dongchuangyp001
Wechat: LYY112126
QQ: 2850632517

2015年6月24日星期三

What’s the difference between impedance speaker and pressure speaker ?

Whats the difference between impedance speaker and pressure speaker ?

Why we choose the impedance speaker when the short distance is transmitted?

Is it the sound quality of the impedance speaker is better than the pressure sound box?

Why the quality of impedance speaker is better than pressures speaker ?

Can we put a transformer in impedance speaker while in long distance so that the sound will
be better ?

Thats the topic we discussed

1.Why we always choose the impedance speaker when in a short distance ?

There is no doubt that the impedance speakers sound will be better
pressure speaker box,impedance speaker box without output transformer
and its frequency response is much wider, it can go to 10HZ-50KHZ
and pressure speaker box output only 150HZ-12KHZ.

2. Can we put a transformer in impedance speaker while in long distance so that the sound will be better ?

There is not must be good for the amplifier with transformer output,it can not be worked
to put a transformer in impedance speaker while in long distance .If you want to
add a transformer putput in amplifier, but also in the terminal box
that followed an impedance matching transformer. If you are a professional technical staff,
this is still possible, but if not professional ,we suggest you'd better don't like to change, because this involved and many design parameters, it may get bad with all your machine were burned.

In short, the impedance speaker and pressure speaker both have their strengths.  


Kerry Luo
Dongchuang International Industrial Limited
Add: No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA

Tel: 86-757-88773347
Email: dongchuangyp001@126.com
Skype:dongchuangyp001
Wechat: LYY112126
QQ: 2850632517

The problem of setting a resistance power amplifier with different power of ceiling speaker and column speaker

The problem of setting a resistance power amplifier with different power of ceiling speaker and column speaker

Problem Description: power amplifier and a speaker is connected problems, a common fixed resistance amplifier are connected to the two 6W ceiling speakers, a 30W column loudspeaker. Now the question is Ceiling 
Speaker's sound is OK, but the sound of  column speaker too small? What can we solve the problem?

First of all,to confirm if the ceiling speakers and the column speaker is voltage speakers,  if the answer is yes.
Then try changing terminal of the  column speaker! The power amplifier output power is not the same as the 
voltage is not the same, is not a simple split the problem of the transformer in parallel! If it is a certain
 impedance to be reliable, do not casually parallel, what is the general resistance to the power amplifier? Fixed 
resistance also has output high voltage!

Other way :
1.Another channel work with column speaker, independently adjust the volume.
2.Add a 10W volume potentiometer to the two ceiling speakers, individually controlled ceiling speakers, adjust the volume of power amplifier, outdoor column speaker volume moderate, followed by volume controller regulating ceiling speakers.
3.The constant resistance power amplifier is low pressure, the suction top horn and the sound column is the 
constant pressure 100V-120V, the simple use of the output transformer, set the resistance to set the pressure, but with low reliability .
4.Take out the the transformer n column speaker.

Kerry Luo
Dongchuang International Industrial Limited
Add: No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA

Tel: 86-757-88773347
Email: dongchuangyp001@126.com
Skype:dongchuangyp001
Wechat: LYY112126
QQ: 2850632517

2015年6月11日星期四

What’s the main function of public address intercom system ? Where will be used ?

Whats the main function of public address intercom system ? Where will be used ?


Public address intercom system consists of radio host, VOD server, terminal, audios terminal.There are also IP network address box, amplifier, IP network broadcast fire matrix, network radio, POE switches, speakers and other related equipment.

Application of public address intercom system:
Public address intercom system is mainly used in: school, large parks, museums, highway, the banking system, hotel, commercial chain stores, commercial plaza, multinational corporations and so on.

Characteristic of public address intercom system :

1.Public address intercom system use CP / IP network technology which is widely used in today's world, the audio signal to standard IP packet transmission on LAN, is a pure digital IP 
transmission of audio broadcast intercom system. The audio signal transfer on LAN as IP 
standard.

2.Public address intercom system completely solve the traditional audio system of sound 
quality is poor, single function, network is not convenient, maintenance and management of 
complex, interactive low.

3.Public address intercom equipment is simple, convenience of installing and extending, when the audio terminal is connected to the LAN can be a powerful IP digital audio system, they dont need the the cables in each access,.It truly realize the computer network, digital video surveillance, public address intercom, telephone and TV multi network integration.

4.Public address intercom audio echo elimination technique, completely solve the problem of network intercommunication of echo, whistles, dual direction high definition video intercom, broadcast by MP3, 32K audio sampling for calling.
5.Public address intercom  system has audio input interface, can be connected to the radio network, the IP network audio terminal, radio broadcast intercom file.
6.Log query function
7.Simple installation, with RJ45 standard cable, insert router LAN (or switch) any port and it can work immediately.


Kerry Luo
Dongchuang International Industrial Limited
Add: No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA

Tel: 86-757-88773347
Email: dongchuangyp001@126.com
Skype:dongchuangyp001
Wechat: LYY112126
QQ: 2850632517

Why the speaker burnt often ?

Why the speaker burnt often ?

Why the speaker burnt often ? Are there any method to solve this problem ?

There are many reasons cause the speaker burnt, belows are some common reasons:

1.Matching problems,if the power of amplifier is too high,it may burnt the speakers bass,if the power of the amplifier is too low,it may burnt the speakers treble.

2.According to the room size, the speaker is generally a square 10W (30 square is generally 
about 300W, too big to feel noisy, and easy to burn the speaker)

3.The distortion is too big, the voice of speaker is too high and the microphone too easy to whistle, it is easy to burn the speaker 

4.The quality of the speaker,some speaker is with bad quality,it is easy to burn.

The main reason is the "DC", the equipment cut off the top, the output signal approximation 
DC, so burn speakers was burned off . It may there is something wrong with the crossover 
inside,crossover as the frequency and speaker protection function, such as bad it will cause the speaker to burn out.

Matching is not reasonable, debugging problems and equipment itself quality problems may 
cause burn audio speakers, so in before the purchase should pay attention to the matching,
choice of manufacturers, reliable quality, if you need public address system,we are your 
best choice.

Kerry Luo
Dongchuang International Industrial Limited
Add: No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA

Tel: 86-757-88773347
Emaildongchuangyp001@126.com, dongchuangyp001@qq.com
Skype:dongchuangyp001
Wechat: LYY112126
QQ: 2850632517

2015年6月6日星期六

Why the speaker burnt often ?

Why the speaker burnt often ? Are there any method to solve this problem ?

There are many reasons cause the speaker burnt, belows are some common reasons:

1.Matching problems,if the power of amplifier is too high,it may burnt the speakers bass,if the power of the amplifier is too low,it may burnt the speakers treble.

2.According to the room size, the speaker is generally a square 10W (30 square is generally 
about 300W, too big to feel noisy, and easy to burn the speaker)

3.The distortion is too big, the voice of speaker is too high and the microphone too easy to whistle, it is easy to burn the speaker 

4.The quality of the speaker,some speaker is with bad quality,it is easy to burn.

The main reason is the "DC", the equipment cut off the top, the output signal approximation 
DC, so burn speakers was burned off . It may there is something wrong with the crossover 
inside,crossover as the frequency and speaker protection function, such as bad it will cause the speaker to burn out.

Matching is not reasonable, debugging problems and equipment itself quality problems may 
cause burn audio speakers, so in before the purchase should pay attention to the matching, 
choiceof manufacturers, reliable quality, if you need public address system,we are your best 
choice.



Kerry Luo
Dongchuang International Industrial Limited
Add: No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA

Tel: 86-757-88773347
Emaildongchuangyp001@126.com
Skype:dongchuangyp001
Wechat: LYY112126
QQ: 2850632517

2015年6月2日星期二

How to choose the PA speakers in the whole public address system ?

How to choose the PA speakers in the whole public address system ?

There are many kinds of speakers,such as ceiling speakers,wall mount speakers,meeting speakers,horn speakers,garden speakers,indoor/outdoor column speaker,ect.Different environment use different speaker.


As the indoor public address system, in the case of the ceiling can choose embedded, with no cover.This kind of speaker is cheap, simple structure, easy construction is the first choice in this case.



Under the no ceiling recommended use wall mounted speaker or column speaker, such as underground parking lot, due to the low site reverberation effect.




In park, school playgrounds and outdoor venues, we recommend to choose lawn speaker,our lawn speaker adopts a sealing design, with the advantage of rainproof, moisture-proof, cold resistance, heat resistance, impact, security etc., We haven many styles, the appearance like panda, Penguin type, mushroom type, rock type, stumps, tree brand type style.





Kerry Luo
Dongchuang International Industrial Limited
Add: No1 Gonghe Road,Shaxi Huangqi,Nanhai,Foshan,Guangdong,CHINA

Tel: 86-757-88773347
Email: dongchuangyp001@126.com
Skype:dongchuangyp001
Wechat: LYY112126
QQ: 2850632517